compiler-errors

How to fix GCC compilation error when compiling >2 GB of code?

by

So, you already have a program that produces this text: prefactor = +s.ds8*s.ds10*ti[0]->value(); expr = ( – 5/243.*(s.x14*s.x15*csc[49300] + 9/10.*s.x14*s.x15*csc[49301] + 1/10.*s.x14*s.x15*csc[49302] – 3/5.*s.x14*s.x15*csc[49303] -… and double csc19295 = + s.ds0*s.ds1*s.ds2 * ( – 32*s.x12pow2*s.x15*s.x34*s.mbpow2*s.mWpowinv2 – 32*s.x12pow2*s.x15*s.x35*s.mbpow2*s.mWpowinv2 – 32*s.x12pow2*s.x15*s.x35*s.x45*s.mWpowinv2 -… right? If all your functions have a similar “format” (multiply n numbers m times and … Read more

Cannot make a static reference to the non-static method

by

Since getText() is non-static you cannot call it from a static method. To understand why, you have to understand the difference between the two. Instance (non-static) methods work on objects that are of a particular type (the class). These are created with the new like this: SomeClass myObject = new SomeClass(); To call an instance … Read more

Why can’t I use the null propagation operator in lambda expressions?

by

It’s complicated since expression tree lambdas (unlike delegate lambdas) are interpreted by already existing LINQ providers which don’t yet support null propagating. Converting to a conditional expression is not always accurate as there are multiple evaluations while with ?. there’s only a single evaluation for example: customer.Where(a => c.Increment()?.Name) // Written by the user customer.Where(a … Read more

error::make_unique is not a member of ‘std’

by

make_unique is an upcoming C++14 feature and thus might not be available on your compiler, even if it is C++11 compliant. You can however easily roll your own implementation: template<typename T, typename… Args> std::unique_ptr<T> make_unique(Args&&… args) { return std::unique_ptr<T>(new T(std::forward<Args>(args)…)); } (FYI, here is the final version of make_unique that was voted into C++14. This … Read more

How to compile Go program consisting of multiple files?

by

New Way (Recommended): Please take a look at this answer. Old Way: Supposing you’re writing a program called myprog : Put all your files in a directory like this myproject/go/src/myprog/xxx.go Then add myproject/go to GOPATH And run go install myprog This way you’ll be able to add other packages and programs in myproject/go/src if you … Read more

Deserialize JSON with Jackson into Polymorphic Types – A Complete Example is giving me a compile error

by

As promised, I’m putting an example for how to use annotations to serialize/deserialize polymorphic objects, I based this example in the Animal class from the tutorial you were reading. First of all your Animal class with the Json Annotations for the subclasses. import com.fasterxml.jackson.annotation.JsonIgnoreProperties; import com.fasterxml.jackson.annotation.JsonSubTypes; import com.fasterxml.jackson.annotation.JsonTypeInfo; @JsonIgnoreProperties(ignoreUnknown = true) @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include … Read more

A declaration cannot be both ‘final’ and ‘dynamic’ error in Swift 1.2

by

This issue arises because Swift is trying to generate a dynamic accessor for the static property for Obj-C compatibility, since the class inherits from NSObject. If your project is in Swift only, rather than using a var accessor you can avoid the issue via the @nonobjc attribute in Swift 2.0: import Foundation class AAA: NSObject … Read more